Ann. Mo. Bot. Garden 57, 2: 205 (1971) [1970].

Basionym: Parmelia tortuosa Ach., Methodus, Sectio post. (Stockholmiæ): 184 (1803).

Note: There are deviating author citations:
(Nees) Wetmore by Becker (2002: 128) for Zimbabwe
Büdel